Chemical Engineering MCQs

Page No. 394

The operation of a Rotameter is based on ________________?


aVariable flow area


bRotation of a turbine


cPressure drop across a nozzle


dPressure at a stagnation point


View Answer Variable flow area

Which of the following fluid flow measuring devices can measure the largest flow rate ?


aV-notch


bRotameter


cOrificemeter


dWeir


View Answer Weir

Which of the systems having the following transfer function is stable ?


a1/(S2 + 2)


b1/(S2 – 2S + 3)


c1/(S2 + 2S + 2)


dexp (-20 S)/(S2 + 2S – 1)


View Answer 1/(S2 + 2S + 2)

What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?


a0.5 AT


b2 AT


c√(AT)


d1.5 AT


View Answer 2 AT

Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ___________________?


aChromel-alumel


bIron-constantan


cPlatinum-rhodium


dPlatinum-platinum + rhodium


View Answer Iron-constantan

An amplitude ratio of 0.1 corresponds to _____________ decibels?


a20


b-20


c10


d -10


View Answer -20

Transfer function of transportation lag is___________________?


aeTS


be-TS


c1/(Ts + 1)


dNone of these


View Answer e-TS

Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?


a8, 0.6, 0.08


b12, 0.6, 0.12


c8, 0.6, 0.12


d12, 0.4, 0.08


View Answer 12, 0.6, 0.12

Paramagnetism method is not used for the composition determination of ______________ in gases?


aOxygen


bOxides of nitrogen


cCarbon dioxide


dAny of these


View Answer Carbon dioxide

The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?


ae-ηS


b(T1S + 1)/(T2S + 1)


c(T1S/(T2S + 1)


d(T1S + 1)/(T2S


View Answer e-ηS

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